Giant magnetostriction in annealed Co1−xFex thin-films

Dwight Hunter, Will Osborn, Ke Wang, Nataliya Kazantseva, Jason Hattrick-Simpers, Richard Suchoski, Ryota Takahashi, Marcus L. Young, Apurva Mehta, Leonid A. Bendersky, Sam E. Lofland, Manfred Wuttig and Ichiro Takeuchi ()
Additional contact information
Dwight Hunter: University of Maryland
Will Osborn: Material Measurement Laboratory, National Institute of Standards and Technology
Ke Wang: Material Measurement Laboratory, National Institute of Standards and Technology
Nataliya Kazantseva: Institute of Metal Physics, Urals Branch of the Academy of Sciences
Jason Hattrick-Simpers: Material Measurement Laboratory, National Institute of Standards and Technology
Richard Suchoski: University of Maryland
Ryota Takahashi: University of Maryland
Marcus L. Young: School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University
Apurva Mehta: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
Leonid A. Bendersky: Material Measurement Laboratory, National Institute of Standards and Technology
Sam E. Lofland: Rowan University
Manfred Wuttig: University of Maryland
Ichiro Takeuchi: University of Maryland

Nature Communications, 2011, vol. 2, issue 1, 1-7

Abstract: Abstract Chemical and structural heterogeneity and the resulting interaction of coexisting phases can lead to extraordinary behaviours in oxides, as observed in piezoelectric materials at morphotropic phase boundaries and relaxor ferroelectrics. However, such phenomena are rare in metallic alloys. Here we show that, by tuning the presence of structural heterogeneity in textured Co1−xFex thin films, effective magnetostriction λeff as large as 260 p.p.m. can be achieved at low-saturation field of ~10 mT. Assuming λ100 is the dominant component, this number translates to an upper limit of magnetostriction of λ100≈5λeff >1,000 p.p.m. Microstructural analyses of Co1−xFex films indicate that maximal magnetostriction occurs at compositions near the (fcc+bcc)/bcc phase boundary and originates from precipitation of an equilibrium Co-rich fcc phase embedded in a Fe-rich bcc matrix. The results indicate that the recently proposed heterogeneous magnetostriction mechanism can be used to guide exploration of compounds with unusual magnetoelastic properties.

Date: 2011
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DOI: 10.1038/ncomms1529

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